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 | Acesso ao texto completo restrito à biblioteca da Embrapa Caprinos e Ovinos. Para informações adicionais entre em contato com cnpc.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
01/08/1992 |
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Data da última atualização: |
06/06/2023 |
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Autoria: |
HART, I. C. |
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Título: |
Seasonal factors affecting the release of prolactin in goats in response to milking. |
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Ano de publicação: |
1975 |
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Fonte/Imprenta: |
Journal Endocrinology, v. 64, n. 2, p. 313-322, Feb. 1975. |
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DOI: |
10.1677/joe.0.0640313 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: An investigation has been carried out in goats of the possible seasonal factors which might influence the autumn decline in the average concentration of prolactin released at milking. Serial blood samples were taken during milking, once a month between August and December 1972, from groups of mated, non-mated and ovariectomized goats and also from goats maintained in summer light conditions (17 h light: 7 hr darkness). Since high levels of progesterone occur in the circulation during the major part of the oestrous cycle and pregnancy in the goat, the same sampling procedure was carried out earlier in the year (June-August) in animals which had been implanted with progesterone tablets. Although high levels of progesterone in the circulation inhibited the release of prolactin at milking, oestrus, mating and pregnancy were not found to be responsible for the fall in prolactin levels in the blood in the autumn. In each of these cases the concentration of prolactin released at milking decreased uniformly between August and October. Housing goats in summer lighting conditions, however, maintained the release of prolactin at milking at a consistently high level from August until December, but had no effect on the milk yield which declined in a manner similar to that of the control animals. It is concluded that daylength is the predominant factor governing the autumn decline in the concentration of prolactin released at milking and that the decline is not the major cause of the fall in milk production during late lactation in goats. MenosAbstract: An investigation has been carried out in goats of the possible seasonal factors which might influence the autumn decline in the average concentration of prolactin released at milking. Serial blood samples were taken during milking, once a month between August and December 1972, from groups of mated, non-mated and ovariectomized goats and also from goats maintained in summer light conditions (17 h light: 7 hr darkness). Since high levels of progesterone occur in the circulation during the major part of the oestrous cycle and pregnancy in the goat, the same sampling procedure was carried out earlier in the year (June-August) in animals which had been implanted with progesterone tablets. Although high levels of progesterone in the circulation inhibited the release of prolactin at milking, oestrus, mating and pregnancy were not found to be responsible for the fall in prolactin levels in the blood in the autumn. In each of these cases the concentration of prolactin released at milking decreased uniformly between August and October. Housing goats in summer lighting conditions, however, maintained the release of prolactin at milking at a consistently high level from August until December, but had no effect on the milk yield which declined in a manner similar to that of the control animals. It is concluded that daylength is the predominant factor governing the autumn decline in the concentration of prolactin released at milking and that the decline is not the major cause o... Mostrar Tudo |
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Palavras-Chave: |
Administration dosage; Jugular Veins. |
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Thesagro: |
Caprino; Leite; Produção. |
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Thesaurus Nal: |
Castration; Circadian rhythm; Goats; Pregnancy; Progesterone; Prolactin; Reproduction; Sexual behavior. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02355naa a2200289 a 4500
001 1522114
005 2023-06-06
008 1975 bl uuuu u00u1 u #d
024 7 $a10.1677/joe.0.0640313$2DOI
100 1 $aHART, I. C.
245 $aSeasonal factors affecting the release of prolactin in goats in response to milking.$h[electronic resource]
260 $c1975
520 $aAbstract: An investigation has been carried out in goats of the possible seasonal factors which might influence the autumn decline in the average concentration of prolactin released at milking. Serial blood samples were taken during milking, once a month between August and December 1972, from groups of mated, non-mated and ovariectomized goats and also from goats maintained in summer light conditions (17 h light: 7 hr darkness). Since high levels of progesterone occur in the circulation during the major part of the oestrous cycle and pregnancy in the goat, the same sampling procedure was carried out earlier in the year (June-August) in animals which had been implanted with progesterone tablets. Although high levels of progesterone in the circulation inhibited the release of prolactin at milking, oestrus, mating and pregnancy were not found to be responsible for the fall in prolactin levels in the blood in the autumn. In each of these cases the concentration of prolactin released at milking decreased uniformly between August and October. Housing goats in summer lighting conditions, however, maintained the release of prolactin at milking at a consistently high level from August until December, but had no effect on the milk yield which declined in a manner similar to that of the control animals. It is concluded that daylength is the predominant factor governing the autumn decline in the concentration of prolactin released at milking and that the decline is not the major cause of the fall in milk production during late lactation in goats.
650 $aCastration
650 $aCircadian rhythm
650 $aGoats
650 $aPregnancy
650 $aProgesterone
650 $aProlactin
650 $aReproduction
650 $aSexual behavior
650 $aCaprino
650 $aLeite
650 $aProdução
653 $aAdministration dosage
653 $aJugular Veins
773 $tJournal Endocrinology$gv. 64, n. 2, p. 313-322, Feb. 1975.
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Embrapa Caprinos e Ovinos (CNPC) |
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| Registros recuperados : 7 | |
| 1. |  | MINELLA, E.; CIULLA, C.; OPPELT, D.; WOBETO, C.; NOVATZKI, M. Safra brasileira de cevada: resultados 2005. In: REUNIÃO NACIONAL DE PESQUISA DE CEVADA, 26., 2007, Passo Fundo. Anais... Passo Fundo: Embrapa Trigo, 2007. p. 98-101. (Embrapa Trigo. Documentos, 76). Organizado por Euclydes Minella.| Tipo: Artigo em Anais de Congresso / Nota Técnica |
| Biblioteca(s): Embrapa Trigo. |
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| 2. | | MINELLA, E.; CIULLA, C.; OPPELT, D.; WOBETO, C.; NOVATZKI, M. Safra brasileira de cevada: resultados 2006. In: REUNIÃO NACIONAL DE PESQUISA DE CEVADA, 26., 2007, Passo Fundo. Anais... Passo Fundo: Embrapa Trigo, 2007. p. 102-105. (Embrapa Trigo. Documentos, 76). Organizado por Euclydes Minella.| Tipo: Artigo em Anais de Congresso / Nota Técnica |
| Biblioteca(s): Embrapa Trigo. |
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| 4. | | AMABILE, R. F.; MINELLA, E.; CAPETTINI, F.; RIBEIRO JÚNIOR, W. Q.; CIULLA, C. Melhoramento de cevada e seu efeito no sistema irrigado brasileiro. In: ANDRADE, S. R. M. de; FALEIRO, F. G.; SERENO, J. R.; DALLA CORTE, J. L.; SOUSA, E. dos S. de (Ed.). Resultados de pesquisa para o Cerrado: 2004-2005. Planaltina, DF: Embrapa Cerrados, 2007. p. 51-54.| Tipo: Artigo em Anais de Congresso / Nota Técnica |
| Biblioteca(s): Embrapa Cerrados; Embrapa Trigo. |
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| 5. | | MINELLA, E.; CIULLA, C.; BOTINI, M.; ANTONIAZZI, N.; NOVATZKI, M.; BOROWSKI, D. Z. Safra brasileira de cevada: resultados 2007. In: REUNIÃO NACIONAL DE PESQUISA DE CEVADA, 27., 2009, Passo Fundo. Anais... Passo Fundo: Embrapa Trigo, 2009. Resultados de safra. 4 p. 1 CD-ROM.| Tipo: Artigo em Anais de Congresso / Nota Técnica |
| Biblioteca(s): Embrapa Trigo. |
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| 6. | | AMABILE, R. F.; AQUINO, F. D. V.; MINELLA, E.; MONTEIRO, V. A.; FERRARI, R.; CIULLA, C.; RIBEIRO JÚNIOR, W. Q.; FERNANDES, F. D. Qualidade industrial do malte proveniente de genótipos de cevada cervejeira cultivados sob irrigação no cerrado. Planaltina, DF: Embrapa Cerrados, 2007. 1 folder.| Tipo: Folder/Folheto/Cartilha |
| Biblioteca(s): Embrapa Cerrados. |
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| 7. | | AMABILE, R. F.; AQUINO, F. D. V.; MINELLA, E.; MONTEIRO, V. A.; FERRARI, R.; CIULLA, C.; RIBEIRO JÚNIOR, W. Q.; FERNANDES, F. D. Qualidade industrial do malte proveniente de genótipos de cevada cervejeira cultivados sob irrigação no Cerrado. In: REUNIÃO NACIONAL DE PESQUISA DE CEVADA, 26., 2007, Passo Fundo. Anais... Passo Fundo: Embrapa Trigo, 2007. p. 430-442. (Embrapa Trigo. Documentos, 76). Organizado por Euclydes Minella.| Tipo: Artigo em Anais de Congresso / Nota Técnica | Circulação/Nível: -- - -- |
| Biblioteca(s): Embrapa Cerrados; Embrapa Trigo. |
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| Registros recuperados : 7 | |
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